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<head>
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    <title>Document</title>
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    <div id="app">
        <counter></counter>
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<script type="text/x-template" id="x-btn">
    <button @click="num++">{{num}}次</button>
</script>
<script>
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        data: function () {
            return {
                num: 0
            }
        },
        template: '#x-btn'
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    let vm = new Vue({
        el: '#app'
    })
</script>

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